Create a copy of the list not referencing the contained objects

Question

Say I have a vector a defined as:

a = [[1,2,3],[-1,-2,-3]]

I have learned that to create a copy of the object a w

Answer 1

a[:] creates a shallow copy of the list.

You can use the copy.deepcopy() function to recursively copy the objects, or use a list comprehension:

b = [el[:] for el in a]

This creates a new list object with shallow copies of the nested list objects in a.